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Energy and Dynamics of Grain Boundaries Based on Underlying Mircrostructure
发布时间: 2018-03-30     21:42   【返回上一页】 发布人:项阳


                          北京师范大学数学科学学院

 

数值分析与偏微分方程专题报告

 

报告题目:Energy and Dynamics of Grain Boundaries Based on Underlying Mircrostructure

 

报告人: 项阳 教授 (香港科技大学 )

 

时间地点:42 16:00—17:00, 后主楼 1124

 

邀请人: 张辉/熊金钢

 

报告摘要:Grain boundaries are the interfaces of grains with different orientations in polycrystalline materials. Energetic and dynamic properties of grain boundaries play essential roles in the mechanical and plastic behaviors of the materials. These properties of grain boundaries strongly depend on their microscopic structures. We present continuum models for the energy and dynamics of grain boundaries based on the continuum distribution of the line defects (dislocations or disconnections) on them.  The long-range elastic interaction between the line defects is included in the continuum models to maintain stable microstructure on grain boundaries during the evolution. The continuum models is able to describe both normal motion and tangential translation of the grain boundaries due to both coupling and sliding effects that were observed in atomistic simulations